78049945 has 16 divisors (see below), whose sum is σ = 97206912. Its totient is φ = 60117120.

The previous prime is 78049943. The next prime is 78049949. The reversal of 78049945 is 54994087.

It is not a de Polignac number, because 78049945 - 2¹ = 78049943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78049895 and 78049904.

It is not an unprimeable number, because it can be changed into a prime (78049943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12709 + ... + 17821.

It is an arithmetic number, because the mean of its divisors is an integer number (6075432).

Almost surely, 2^78049945 is an apocalyptic number.

It is an amenable number.

78049945 is a deficient number, since it is larger than the sum of its proper divisors (19156967).

78049945 is a wasteful number, since it uses less digits than its factorization.

78049945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5232.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 78049945 is about 8834.5879926570. The cubic root of 78049945 is about 427.3570444118.

The spelling of 78049945 in words is "seventy-eight million, forty-nine thousand, nine hundred forty-five".